From a3d0ef352529217c9c32ce1a1b1db1420798cbe5 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Sat, 10 Oct 2020 11:07:39 +0200
Subject: [PATCH] configure: allow cross-compilation

Some compilers are in fact a wrapper (e.g. to speed compilation with
ccache or distcc, or as a cross-compiler wrapper). Those wrappers may
not properly recognise the -v option, or may internally enforce some
flags that conflict with -v.

Use --version as a fall-back.

With --version. the compiler will report its executable's basename, e.g.
arm-linux-gcc not gcc. Catter for that by grepping for the compiler
family name.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr:
  - retain "$CC -v" as default, fallback to "$CC --version"
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
---
 configure | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 9d72895..46491f7 100755
--- a/configure
+++ b/configure
@@ -513,9 +513,14 @@ else
   CC_TMP="$CC"
   test -n "$OPT_CC" && OTHER_CC= || OTHER_CC="gcc cc"
   for CC in "$CC_TMP" $OTHER_CC; do
+    cc_name_tmp=
     if run_cmd "$CC -v"; then
       cc_name_tmp=$($CC -v 2>&1 | tail -n 1 | cut -d ' ' -f 1)
-      if test "$cc_name_tmp" = "gcc"; then
+    elif run_cmd "$CC --version"; then
+      cc_name_tmp=$($CC --version 2>&1 | head -n 1 | cut -d ' ' -f 1)
+    fi
+    if test "${cc_name_tmp}"; then
+      if echo "$cc_name_tmp" | grep -q "gcc"; then
         cc_name=$cc_name_tmp
         start_check "$CC version"
         cc_vendor=gnu
@@ -539,7 +544,7 @@ else
         finish_check "$cc_name $cc_version"
         break
       fi
-      if $CC -v 2>&1 | grep -q "clang"; then
+      if echo "$cc_name_tmp" | grep -q "clang"; then
         start_check "$CC version"
         cc_vendor=clang
         cc_version=$($CC -dumpversion 2>&1)
-- 
2.25.1

